| <!DOCTYPE html> |
| <meta charset="utf-8"> |
| <title>Interface prototype objects</title> |
| <link rel="help" href="https://heycam.github.io/webidl/#interface-prototype-object"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script> |
| // A specification issue was raised for this behavior. |
| // https://www.w3.org/Bugs/Public/show_bug.cgi?id=28244 |
| test(function() { |
| // Checks toString() behavior. |
| assert_class_string(Document.prototype, "DocumentPrototype"); |
| |
| assert_true(Document.prototype.hasOwnProperty(Symbol.toStringTag), |
| "An interface prototype object should have toStringTag property."); |
| assert_equals(Document.prototype[Symbol.toStringTag], "DocumentPrototype"); |
| }, "The class string of an interface prototype object is the concatenation of " + |
| "the interface's identifier and the string 'Prototype'."); |
| |
| test(function() { |
| // https://heycam.github.io/webidl/#create-an-interface-prototype-object |
| assert_own_property(Element.prototype, Symbol.unscopables, "Element.prototype has @@unscopables."); |
| let unscopables = Element.prototype[Symbol.unscopables]; |
| assert_equals(typeof unscopables, "object", "@@unscopables is an Object."); |
| assert_equals(Object.getPrototypeOf(unscopables), null, "@@unscopables's prototype is null."); |
| }, "[Unscopable] extended attribute makes @@unscopables object on the prototype object, whose prototype is null."); |
| </script> |
